linux-kernel - [012/156] i2c-i801: Dont use the block buffer for I2C block writes

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Message-Id: <20100330224728.072929273@linux.site>
Date:	Tue, 30 Mar 2010 15:40:46 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jean Delvare <khali@...ux-fr.org>,
	Oleg Ryjkov <oryjkov@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [012/156] i2c-i801: Dont use the block buffer for I2C block writes

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jean Delvare <khali@...ux-fr.org>

commit c074c39d62306efa5ba7c69c1a1531bc7333d252 upstream.

Experience has shown that the block buffer can only be used for SMBus
(not I2C) block transactions, even though the datasheet doesn't
mention this limitation.

Reported-by: Felix Rubinstein <felixru@...il.com>
Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Cc: Oleg Ryjkov <oryjkov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/i2c/busses/i2c-i801.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -415,9 +415,11 @@ static int i801_block_transaction(union
 		data->block[0] = 32;	/* max for SMBus block reads */
 	}
 
+	/* Experience has shown that the block buffer can only be used for
+	   SMBus (not I2C) block transactions, even though the datasheet
+	   doesn't mention this limitation. */
 	if ((i801_features & FEATURE_BLOCK_BUFFER)
-	 && !(command == I2C_SMBUS_I2C_BLOCK_DATA
-	      && read_write == I2C_SMBUS_READ)
+	 && command != I2C_SMBUS_I2C_BLOCK_DATA
 	 && i801_set_block_buffer_mode() == 0)
 		result = i801_block_transaction_by_block(data, read_write,
 							 hwpec);


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